EP1670747A2 - Separation of aromatic amine from a phenolic compound - Google Patents
Separation of aromatic amine from a phenolic compoundInfo
- Publication number
- EP1670747A2 EP1670747A2 EP04794521A EP04794521A EP1670747A2 EP 1670747 A2 EP1670747 A2 EP 1670747A2 EP 04794521 A EP04794521 A EP 04794521A EP 04794521 A EP04794521 A EP 04794521A EP 1670747 A2 EP1670747 A2 EP 1670747A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- hydroxide
- base
- combinations
- sodium
- glycol
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/84—Purification
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C209/00—Preparation of compounds containing amino groups bound to a carbon skeleton
- C07C209/82—Purification; Separation; Stabilisation; Use of additives
- C07C209/86—Separation
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
- C07C211/43—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
- C07C211/44—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring
- C07C211/45—Monoamines
- C07C211/46—Aniline
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C211/00—Compounds containing amino groups bound to a carbon skeleton
- C07C211/43—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton
- C07C211/44—Compounds containing amino groups bound to a carbon skeleton having amino groups bound to carbon atoms of six-membered aromatic rings of the carbon skeleton having amino groups bound to only one six-membered aromatic ring
- C07C211/45—Monoamines
- C07C211/47—Toluidines; Homologues thereof
Definitions
- the invention relates to a process for separation of an aromatic amine from a phenolic compound in a mixture comprising the aromatic amine and phenolic compound.
- Aromatic amines are important industrial chemicals. They can be used to produce a very important class of industrial compounds such as azo dyes. Aromatic amines can be produced by chemical reduction of nitro compounds with a metal and acid such as, for example, iron or tin and hydrochloric acid or by catalytic hydrogenation using molecular hydrogen and a hydrogenation catalyst such as nickel or platinum. Nitro compounds can be readily made by direct nitration of aromatic compounds.
- the product mixture produced by catalytic hydrogenation of an aromatic nitro compound generally comprises the desired amine, a corresponding phenolic compound, and unreacted aromatic nitro compound.
- a process comprises contacting a product mixture with a base, optionally in the presence of a polyhydric alcohol, to produce a base-treated mixture and distilling the base-treated mixture in which the product mixture comprises an aromatic amine and a phenolic compound.
- An aromatic amine can be produced by catalytic reduction or hydrogenation of an aromatic nitro compound, either under liquid phase or gas phase. The reduction or hydrogenation can be carried out under any suitable conditions known to one skilled in the art, continuously, semi-continuously, or batch- wise.
- a suitable condition can include a temperature in the range of from about 30°C to about 300°C, preferably about 80°C to about 250°C; a pressure that can accommodate the temperature such as about 1 arm (103 kPa) to about 20 atm (300 psig, 2000 kPa), preferably about 150 kPa to about 800 kPa; and for a sufficient period of time such as from about one to about 100 minutes.
- Any hydrogenation catalysts known to one skilled in the art such as, for example, nickel, iron, platinum, copper, cobalt, palladium, iridium, and combinations of two or more thereof can be used in the production of aromatic amine.
- a catalyst can be present in a catalytic amount effective to catalyze the hydrogenation or reduction and can be in the range of from about 1 to about 10,000 ppm (mg per kg) aromatic nitro compound.
- the hydrogenation or reduction process produces a product mixture or crude product, which comprises desired amine and impurities.
- a desired amine can have the formula of RAr(CH 2 ) p NR 1 where Ar is an arylene group; R and each R 1 can be the same or different; each R 1 is independently selected from the group consisting of hydrogen, halogen, alkyl group, aryl group, and combinations of two or more thereof; and p is a number from 0 to 3.
- amine products include, but are not limited to, aniline, toluidines, chloroanilines, bromoanilines, iodoanilines, chlorotoluidines, bromotoluidines, iodotoluidines, benzylamine, N- benzylamine, ethylanilines, fluoromethylanilines, chloromethylanilines, bromomethylanilines, and combinations of two or more thereof.
- aniline can be produced by the reduction of nitrobenzene with hydrogen either in the liquid phase using a supported hydrogenation catalyst such as nickel or precious metal, or in the gas phase using supported catalysts.
- Phenol is a byproduct, in trace amounts ranging from about 50 to about 1000 mg per kg amine product (ppm).
- Aniline can also be produced by conversion of phenol in the Halcon process.
- toluidine can be produced by reduction of nitrotoluene.
- Nitrotoluene can be vaporized at a temperature in the range of from about 150°C to about 400°C to obtain a vapor or gas phase of nitrotoluene.
- the vapor phase nitrotoluene is then introduced or fed to suitable equipment such as a gas phase vessel or reactor, preferably a fixed bed reactor containing a hydrogenation catalyst.
- Hydrogen can be introduced into the equipment, preferably contemporaneously with the vapor phase nitrotoluene.
- Impurities or by-products associated with the production of aromatic amines include, but are not limited to, unreacted nitro compounds, cyclohexanones, phenolic compounds, ketones, and combinations of two or more thereof.
- phenolic compounds include, but are not limited to, phenol, cresols, chlorophenols, bromophenols, iodophenols, cholortoluidines, bormotoluidines, iodotoluidines, benzylamine, N-benzylamine, ethylphenols, fluoromethylphenols, chloromethylphenols, bromomethylphenols and combinations of two or more thereof. These disclosed examples include all possible isomers.
- any unreacted nitro compound can be present in the product mixture in the range of from 0 to about 1000 ppm and can be readily removed from the crude product by any means known to one skilled in the art such as, for example, distillation. Because such means are well known, the description of which is omitted herein for the interest of brevity.
- a desired amine compound contains lower than 500, preferably lower than 100, and more preferably lower than 50 parts per million (mg/kg) of such phenolic compound.
- the product mixture (or crude product) can be contacted with a base before it is distilled. Any base, organic or inorganic, can be used.
- suitable bases can include, without limitation, lithium hydroxide, sodium hydroxide, sodium hydrosulfide, sodium bisulfide, potassium hydroxide, potassium hydrosulfide, potassium bisulfide, calcium hydroxide, magnesium hydroxide, sodium bicarbonate, sodium carbonate, sodium sulfide, sodium oxide, magnesium oxide, calcium oxide, calcium carbonate, sodium phenoxide, barium phenoxide, calcium phenoxide, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetramethylammonium bisulfide, tetraethylammonium bisulfide, and combinations of any two or more thereof.
- a base can be combined with the crude product at any concentration effective to reduce the phenolic compound contamination to the desired level disclosed above.
- the molar ratio of base to phenolic compound can be in the range of from about 0.5 : 1 to about 10 : 1 , preferably about 1 : 1 to about 3 : 1 or about 1 : 1 to about 2:1.
- the contacting of the crude product with a base can be carried out under any suitable conditions.
- such condition can include a temperature in the range of from about 0°C to about 200°C, preferably about 20°C to about 50°C, a pressure that can accommodate the temperature such as about 1 kPa to about 300 kPa, preferably about 10 kPa to about 110 kPa, and for a sufficient period of time such as from about 0.01 to about 10,000 minutes.
- a base and an amine can also be carried out in the presence of a polyhydric alcohol.
- polyhydric alcohol examples include, but are not limited to trimethylene glycol, triethylene glycol, glycerols, ethylene glycol, diethylene glycol, 1,2-propane diol, 1,3 -propane diol, tripropylene glycol, polyethylene glycols, polypropylene glycols, and combinations of two or more thereof.
- the polyhydric alcohol can be present in the base-amine combination in the range of from about 1 to about 10,000 mg per kg of the total combination.
- a desired amine can be recovered from the base-treated crude product (or product mixture) by, for example, distillation.
- Suitable apparatus for the distillation is any customary apparatus as described for example in Kirk-Othmer, Encyclopedia of Chemical Technology, 3rd Ed. Vol.
- a suitable distillation can include a temperature in the range of from about 100 to about 400, preferably about 100 to about 250°C, a pressure that can accommodate the temperature such as about 0.1 kPa to about 200 kPa, preferably about 5 kPa to about
- Example 1 This example illustrates reduction of phenol in aniline using KOH.
- To a distillation flask was added 100 ml of commercial aniline containing 122 ppm (mg/kg) phenol (a final product produced from a DuPont commercial plant at Beaumont, Texas, USA) and potassium hydroxide (53.5 mg) dissolved in 64.4 mg of water. This was connected to a distillation head containing a short vigreux column. Reduced pressure (42 mmHg (5.6 kPa)) distillation was continued until 75 ml of aniline was in the receiver. GC analysis of the distillate revealed the phenol content was 7.4 ppm.
- the phenol content of the material still in the distilling flask was 321 ppm based on 25 ml aniline remaining in the flask.
- 100 ml of commercial aniline and potassium hydroxide (52 mg) in 66 mg of water was added to a distillation flask. This was vacuum distilled at 40 mmHg (5.33 kPa) and three cuts taken, 79.4g, 8.1g and 8.4g. The phenol content of these cuts were respectively 4 ppm, 3 ppm, and ⁇ 1 ppm (non-detect).
- the phenol content of the distillation residue was 2391 ppm.
- Example 2 This example shows reduction in phenol content in aniline using NaOH. To a distillation flask was added 100 ml of commercial aniline (phenol 122 ppm) and sodium hydroxide (35.7 mg) dissolved in 93 mg of water. The same procedure as Example 1 was followed. The distillate (75 ml) had a phenol content of 19 ppm. The phenol content of the material remaining in the distilling was 374 ppm. '
- Example 3 This example shows using KOH and unrectified crude aniline.
- a series of runs was conducted using a sample of crude, unrectified, aniline obtained from a commercial plant, which had a phenol content of 107 ppm to determine the efficiency of removing phenol with various doses of potassium hydroxide.
- An unrectified aniline was a crude plant aniline which had been dewatered but not detared in the final (rectifying) distillation column.
- To a distillation flask was added 50 ml of crude aniline and 35 ⁇ l of 50% potassium hydroxide in water. Distillation was performed at 90 mm Hg (12 kPa) pressure using a five plate Oldershaw column and vacuum distillation head. Distillation was stopped on obtaining 48.9 g of aniline distillate. This had a phenol content of 2.7 ppm.
- the results are shown in the following table.
- Example 4 This example illustrates using a polyhydric alcohol. To a distilling flask was added 50 ml of crude aniline, 40 ⁇ l of 50% potassium hydroxide and 100 ⁇ l of polyethylene glycol (avg. Mn ca. 400, "PEG 400", Aldrich Chemical Company, Milwaukee, Wisconsin). The resulting mixture was vacuum distilled at 90 mm giving 46.6 g of aniline distillate containing 1.1 ppm of phenol.
- Example 5 This example shows treating o-toluidine with KOH.
- Aqueous potassium hydroxide solution (45%; 0.1055 g) was charged into a three neck round bottom flask (500 ml) followed by 123.5g of o- toluidine (OTOL) containing 489.1 ppm of o-cresol.
- OTOL was a commercial product commercially available from First Chemical Corp., Pascagoula, Mississippi.
- An Aldrich Oldershaw column (ten stages) with a short path distillation head on top of the column was attached to the flask. The mixture in the flask was agitated with a magnetic spin bar while vacuum was gradually pulled down to 90 mmHg (12 kPa).
- the pot temperature was raised using a heating mantle to distill OTOL.
- the typical distillation conditions were: pot temperature 130°C, overhead temperature 125°C, vacuum 90 mmHg (12 kPa). The distillation was stopped when boil up slowed down and the overhead temperature started falling. Distillate (108.5 g) was collected and was analyzed with GC to find o-cresol non- detectable. In separate runs, a plant distilled OTOL sample, obtained from a storage tank, having 133.3 ppm of o-cresol was used. A different amount of o-cresol was added to the sample to make OTOL with different concentrations of o-cresol.
- the OTOL was then mixed with aqueous KOH solution (45%) at different KOH/o-cresol mole ratios and distilled through a ten-stage Oldershaw column under vacuum.
- the distillation conditions were similar to the plant OTOL distillation conditions disclosed above.
- the results summarized in the following table (ND denotes non-detectable) demonstrate that the invention process substantially reduced the o-cresol content in OTOL.
- Example 6 This example shows using a polyhydric alcohol to stabilize excess KOH.
- o-cresol was added to OTOL to raise the o- cresol concentration to 8.8%.
- KOH 45%
- the pot temperature was raised under vacuum to strip water and then to reflux OTOL for 8 hours.
- OTOL (20% of the charge) was distilled through the ten-stage column.
- the overhead sample showed 10.1 ppm of o-cresol.
- the potassium o-cresolate concentration was about 14% in the pot. It was noted that some white salt (excess KOH) coated on the flask bottom. Poly(ethylene glycol) was then added to the pot. The amount of PEG charged was the same as the KOH (45%) charge. After being agitated at 120°C for 20 minutes, all the salts went into the solution.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US51069003P | 2003-10-10 | 2003-10-10 | |
US10/798,083 US7049471B2 (en) | 2003-10-10 | 2004-03-11 | Separation of amine from a phenolic compound |
PCT/US2004/033199 WO2005037767A2 (en) | 2003-10-10 | 2004-10-06 | Spearation of aromatic amine from a phenolic compound |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1670747A2 true EP1670747A2 (en) | 2006-06-21 |
EP1670747B1 EP1670747B1 (en) | 2009-05-13 |
Family
ID=34426239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04794521A Revoked EP1670747B1 (en) | 2003-10-10 | 2004-10-06 | Separation of aromatic amine from a phenolic compound |
Country Status (9)
Country | Link |
---|---|
US (1) | US7049471B2 (en) |
EP (1) | EP1670747B1 (en) |
JP (1) | JP4672668B2 (en) |
KR (2) | KR101186434B1 (en) |
CN (1) | CN1946675B (en) |
DE (1) | DE602004021122D1 (en) |
HK (1) | HK1101391A1 (en) |
PT (1) | PT1670747E (en) |
WO (1) | WO2005037767A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2641892A1 (en) | 2012-03-23 | 2013-09-25 | Bayer MaterialScience AG | Method for cleaning aniline from gas phase hydrogenation |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4552941B2 (en) * | 2006-01-17 | 2010-09-29 | 住友化学株式会社 | Method for purifying and producing aniline |
DE102006007620A1 (en) * | 2006-02-18 | 2007-08-23 | Bayer Materialscience Ag | Production of crude aniline for use in producing di- and polyamines, involves purifying crude aniline by adding aqueous alkali metal hydroxide solution to crude aniline prior to and/or during distillation |
DE102006007619A1 (en) * | 2006-02-18 | 2007-08-23 | Bayer Materialscience Ag | Preparing aniline, useful to prepare e.g. di- and polyamine, comprises hydrogenating nitrobenzene to obtain raw aniline, extracting raw aniline with aqueous alkali metal hydroxide solution and separating aqueous- and organic phase |
DE102006052989A1 (en) * | 2006-11-10 | 2008-05-15 | Bayer Materialscience Ag | Process for the removal of compounds with phenolic hydroxy groups from aromatic amines |
DE102007039091A1 (en) | 2007-08-18 | 2009-02-19 | Bayer Materialscience Ag | Process for the purification of aromatic amines |
DE102009025374A1 (en) | 2009-06-18 | 2010-12-23 | Bayer Materialscience Ag | Process for the preparation of aromatic amines |
DE102010042731A1 (en) | 2010-10-21 | 2012-04-26 | Bayer Materialscience Aktiengesellschaft | Process for purifying aniline from gas-phase hydrogenations |
US8809587B2 (en) | 2010-12-30 | 2014-08-19 | Kellogg Brown & Root Llc | Systems and methods for producing aromatic amines and removing phenol therefrom |
DE102011081897A1 (en) | 2011-08-31 | 2013-02-28 | Bayer Materialscience Aktiengesellschaft | Catalyst and process for the preparation of aromatic amines in the gas phase |
PT3643699T (en) | 2018-10-17 | 2021-12-14 | Covestro Intellectual Property Gmbh & Co Kg | Method for the purification of aniline |
CN110252088B (en) * | 2019-06-25 | 2021-11-02 | 运城晋腾化学科技有限公司临猗分公司 | Recovery system of aniline in tail gas |
JP2022538663A (en) | 2019-07-03 | 2022-09-05 | コベストロ・インテレクチュアル・プロパティ・ゲゼルシャフト・ミット・ベシュレンクテル・ハフツング・アンド・コー・カーゲー | Aniline purification method |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1942838A (en) * | 1928-08-22 | 1934-01-09 | Goodrich Co B F | Method of recovering amines and phenols from their aqueous solutions |
US3682782A (en) * | 1968-07-11 | 1972-08-08 | Halcon International Inc | Reduced pressure distillation process for recovering aniline from phenolaniline mixtures |
JPS4935341A (en) * | 1972-07-31 | 1974-04-01 | ||
JPS5519211A (en) * | 1978-07-27 | 1980-02-09 | Mitsui Toatsu Chem Inc | Purification of organic amine |
US4267391A (en) * | 1979-06-29 | 1981-05-12 | Koppers Company, Inc. | Process for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols characterized by urea clathration of metal-cresol |
US4267390A (en) * | 1979-06-29 | 1981-05-12 | Koppers Company, Inc. | Process for obtaining para-cresol and meta-cresol from a mixture of methylated and ethylated phenols characterized by selective complexation with calcium bromide and sodium acetate |
US4491673A (en) * | 1982-04-19 | 1985-01-01 | Monsanto Company | Production and separation of amines |
JPS60199861A (en) * | 1984-03-23 | 1985-10-09 | Mitsui Toatsu Chem Inc | Purification of aromatic diamine |
US5192399A (en) * | 1991-01-30 | 1993-03-09 | E. I. Du Pont De Nemours And Company | Purification of aminonitriles or diamines |
IL98520A (en) * | 1991-06-16 | 1996-10-31 | Bromine Compounds Ltd | Purification of diaminodiphenyl compounds |
JP3804082B2 (en) * | 1995-04-27 | 2006-08-02 | 住友化学株式会社 | Purification method of aniline |
DE10228594B4 (en) * | 2002-06-26 | 2006-06-08 | Lanxess Deutschland Gmbh | Preparation of colorless dibenzylamine |
-
2004
- 2004-03-11 US US10/798,083 patent/US7049471B2/en not_active Expired - Fee Related
- 2004-10-06 PT PT04794521T patent/PT1670747E/en unknown
- 2004-10-06 CN CN2004800295695A patent/CN1946675B/en not_active Expired - Fee Related
- 2004-10-06 KR KR1020067006705A patent/KR101186434B1/en not_active IP Right Cessation
- 2004-10-06 EP EP04794521A patent/EP1670747B1/en not_active Revoked
- 2004-10-06 DE DE602004021122T patent/DE602004021122D1/en active Active
- 2004-10-06 JP JP2006534370A patent/JP4672668B2/en not_active Expired - Fee Related
- 2004-10-06 WO PCT/US2004/033199 patent/WO2005037767A2/en active Search and Examination
- 2004-10-06 KR KR1020127009690A patent/KR20120040759A/en not_active Application Discontinuation
-
2007
- 2007-08-29 HK HK07109412.4A patent/HK1101391A1/en not_active IP Right Cessation
Non-Patent Citations (1)
Title |
---|
See references of WO2005037767A2 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2641892A1 (en) | 2012-03-23 | 2013-09-25 | Bayer MaterialScience AG | Method for cleaning aniline from gas phase hydrogenation |
WO2013139737A1 (en) | 2012-03-23 | 2013-09-26 | Bayer Intellectual Property Gmbh | Process for the purification of aniline from gas phase hydrogenations |
Also Published As
Publication number | Publication date |
---|---|
JP4672668B2 (en) | 2011-04-20 |
KR101186434B1 (en) | 2012-09-27 |
HK1101391A1 (en) | 2007-10-18 |
CN1946675B (en) | 2011-06-15 |
JP2007508312A (en) | 2007-04-05 |
PT1670747E (en) | 2009-08-05 |
DE602004021122D1 (en) | 2009-06-25 |
CN1946675A (en) | 2007-04-11 |
KR20120040759A (en) | 2012-04-27 |
US7049471B2 (en) | 2006-05-23 |
US20050080294A1 (en) | 2005-04-14 |
WO2005037767A3 (en) | 2005-06-23 |
EP1670747B1 (en) | 2009-05-13 |
WO2005037767A2 (en) | 2005-04-28 |
KR20060120020A (en) | 2006-11-24 |
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